Brake



sept. 12, 1933. G. H. HUNT 1,926,385

BRAKE Filed Deo. 1o, 1931 y /8 n mii!" .lil 'mmm I J//ff/ INVENTORBYGEORGEH. HUNT A TT ORNE Y Patented Sept. i2, 1933 s'rA'rss Bendix inda corporation of Aviation Corporation, South Bend,

Delaware l Application December 10, 1931 Serial No. 580,119?

d Claims.

This invention relates to brakes and more particularly to internalexpanding brakes.

Broadly, the invention comprehends an outboard anchor for the frictionelements of an in- 'tornai expanding brake illustrated as being of thethree-shoe type. In the illustrated embodi` nient, the friction elementsor shoes of a brake are anchored on a backing plate through theinstrumentality. of an anchor preferably formed l0 in a homogeneousinass having a flange which may be riveted or otherwise secured to thebacking plate and a slot in which the friction elements or shoes areanchored. .fis shown, the anchored ends oi' the secondary and auxiliaryyfriction elements or shoes are arranged in interoverlapping relationand einbrace suitable pivots pa transversely through the slotted portionof the anchor.

A major object oi' the invention is to provide an anchor for thefriction elements Vof a brake having great strength and rigidity.

Another object of the invention is to provide an anchor for the frictionelements of an internal expanding brake constructed and arranged towithstand all stresses and strains imposed thereon.

n iurthcr object of the invention is to provide an for the frictionelements of an internal expanding brake having attaching means andpivots for the friction elements.

Still further object of the invention is to provide an anchor for thefriction elements of an internal expanding braise spaced sup-- ports forpivot oernoers on which the friction eleincntsanchor, so that str sesand strains iinposed on the anchor may be equally distributed.

A feature of the invention an anchor for the friction elements of abrake having spaced supports for the anchor pins.

Another feature of the invention is a slotted member having parallelbores arranged transversely of the slot for the reception of an- Chorpins, and friction elements having overlapping interleang ends anchoredon the pins within the slot.

above and other objects and features of the invention including variousdesirable details of structure will be apparent from the followingscription ci the illustrated embodiment shown in the accompanyingdrawing, and in which:

Figure l is a vertical sectional view of a brake structure taken justbach of the head of the drum, illustrating the invention as applied; and

Figure 2 is a sectional view substantially on `line 2 2, Figure l.

Referring by numerals to the drawing, represents a iixed support such asa backing plate. The backing plate associated therewith a rotatable druml2 which may be secured to a wheel, not shown. Positioned on the backingplate is an anchor lll. The anchor comprises a mass or a block havinga'base or flange seated against the backing plate and having a slot 16and parallel Ybores 18 and 2G transversely disposed with respect to theslot. Positioned in the `bores i8 ando are anchor pins or bolts 22 and2li. Each anchor pin has a substantial head 26 bearing flush against thetop of the anchor and a stein extending through the backing plate toreceive a' nut 28 with a loch washer interposed.

Pivoted on the anchor pin 24 is a friction element Se having pivotallyconnected thereto a friction element 32. The friction element has abiiurcated end portieri Sli, the object of which Will hereinafterappear, and a suitable bearing 36 embracing the anchor pin. Pivoted onthe anchor pin 22 is a friction element 38. The anchored end oi thiselement is positioned between trie bifurcated portion 3a oi the frictionelement 3G and is provided with a suitable bearing 40 embracing the pin.

, The friction elements 32 and 38 have posin tioneol for rotation ontheir respective separable ends rollers Li2 and fifi. A cani i6 ispositioned for rotation between these rollers for spreading the shoesinto drum engagement, and the cam is secured to a shaft Li8 suitablyconnected to a power operating not shown.

A suitable return spring 5G connects the friction elements 32 and andthe friction element 30 is conne of? by an auxiliary return Cile. spring52 to therbacking plate. These springs serve to return the frictionelements to the oi v position upon release oi force applied through thecam and to retain them when in the ofi position in proper spacedrelation to the drum.

lit will be understood that the form of the in vention herein describedis to be taken as'the preferred example of the underlying principle ofthe invention and that various changes in shape, size and arrangement ofparts may be resorted to without departing from the spirit of theinvention or the scope of the subjoined claims.

Having thus described the various features of the invention what I claimas new and desire to secure by Letters Patent is:

'1. A brake comprising a xed support, a block secured to the iiXedsupport having a slot parallel to the Xed support and parallel borestransversely disposed to the slot, and anchor pins in the boresadditionally securing the block to the support.

2. A brake comprising a xed support, a block having a slot and parallelbores transversely disposed to the slot, a flange on the block forattaching the block to the fixed support, and anchor bolts extendingthrough the bores and fixed support.

3. A brake comprising a fixed support, a rotatable drum associatedtherewith, a block secured to the xed support having a slot parallel tothe iixed support and parallel bores transversely disposed to the slot,`anchor bolts in the bores securing the block to the fixed support,

Yand xed support, friction elements anchored on the anchor bolts withtheir anchored ends overlapping one another, and means for spreading theshoes into drum engagement.

GEORGE H. HUNT.

